A241702 Number of connected graphs on n nodes with chromatic number 7.

0, 0, 0, 0, 0, 0, 1, 6, 110, 4125, 389583

Offset

1,8

Comments

A diagonal of triangle in A126736.

Links

Table of n, a(n) for n=1..11.

Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs

T. Hoppe and A. Petrone, Integer sequence discovery from small graphs, arXiv preprint arXiv:1408.3644 [math.CO], 2014.

F. Hüffner, tinygraph, software for generating integer sequences based on graph properties.

Eric Weisstein's World of Mathematics, Chromatic Number

Crossrefs

Sequence in context: A156554 A197325 A197978 * A302866 A243511 A199222

Adjacent sequences: A241699 A241700 A241701 * A241703 A241704 A241705

Keyword

nonn,hard,more

Author

Travis Hoppe and Anna Petrone, Apr 27 2014

Extensions

a(11) added using tinygraph by Falk Hüffner, Apr 04 2017

Status

approved